for和since的用法

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for和since的用法

for +一段时间
since +句子
since +一段时间+ ago
since +时间点
例如 he has been dead for three years
he has been dead since three years ago
He has studied English since 2003
He has studied English since he was ten years old

for和since的用法 since和for的区别用法 since for的具体用法 since与for的用法现在完成时since和for的用法,要具体的讲解 Because , Since , . As , For 的意思和用法 during over since for的用法和时态 since 和 for 在完成时中用法的区别 for和since的用法有什么不同像as,since,for,等等介词的意思,和用法, Because ,Since ,.As ,For 的意思和用法 SINCE和FOR的用法,什么是时间点,什么是时间段?